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What Were the First Mirrors?
What Were the First Mirrors? Probably the first mirror was the surface of a quiet pond. Our earliest ancestors must have noticed that they…
Why Did Dinosaurs Die Out?
Why Did Dinosaurs Die Out? Since their discovery in the nineteenth century, the reason for the dinosaurs' demise has been a matter of specul
How Does a Sewing Machine Sew?
How Does a Sewing Machine Sew? Most home sewing machines sew with two threads. An exposed thread fits through the needle's eye. Another thre
When Were Pajamas Invented?
When Were Pajamas Invented? Traditionally, many Americans donned a long night shirt before going to bed up until the late 1880's. But, after
Why Does a Doughnut Have a Hole?
The hole in the doughnut allows the dough to cook more thoroughly. At first the doughnut didn't have a hole. It was just a…